Videogame publisher ZeniMax claim that Oculus unlawfully used its intellectual property, in part by hiring programmer John Carmack as its chief technology officer, to develop the virtual-reality system that includes the Rift headset back in 2014.

Carmack, known for his contributions to such games as “Quake” and “Doom,” worked for id Software before that firm was acquired by ZeniMax.

The Oculus acquisition was more expensive than the $2 billion price tag indicated, Zuckerberg said in court, describing $700 million spent to retain employees and $300 million in payouts for reaching milestones.

Oculus originally wanted $4 billion, he said.
ZeniMax lawyer Tony Sammi questioned whether Facebook knew what it was doing when it made the acquisition.

Zuckerberg said the Oculus deal was done over a weekend in 2014, which Sammi said did not show sufficient due diligence.

But Zuckerber claimed in later testimony that Facebook researched Oculus for months.
He said he was not aware of any theft claims against Oculus.

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"It's pretty common when you announce a big deal that people just come out of the woodwork and claim they own some part of the deal," Zuckerberg said.
On the stand, he also gave details about Facebook's $22 billion purchase of messaging service WhatsApp in 2014.

While the deal was in progress, another company he did not identify made a last-minute bid that was higher, Zuckerberg said, but WhatsApp declined because of its good relationship with Facebook.
The Oculus lawsuit, in the sixth day of a jury trial, relates in part to programmer John Carmack.
Well-known for helping to conceive games such as "Quake" and "Doom," Carmack worked for id Software LLC before that company was acquired by ZeniMax. He is now the chief technology officer at Oculus.
Zuckerberg denied that Carmack has unfairly used computer code from his previous position. "There is no shared code in what we do," he said.
Zuckerberg said he has been interested in virtual reality since he was a student, but thought it was decades away from happening before he encountered Oculus. He told jurors how he used virtual reality to capture his daughter's first steps, so her grandparents could experience it later.
"We want to get closer to this kind of perfect representation, so you can capture a moment you had," he said.

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